Leigh Anne O'Connor, a lactation consultant in New York, is anxiously awaiting the Supreme Court's decision on President Barack Obama's health overhaul.

She is worried that if the court strikes down the law, it would wipe out a provision requiring larger employers to give women time and a private space to pump breast milk.

It isn't just large employers, medical businesses and constitutional scholars who are invested in the court's decision. Chain restaurants, tanning salons, breast-feeding advocacy groups and others far afield of health care have a lot riding on whether the law stays in place.

The broad interest in the decision underscores how the law touches nearly every American and most businesses, often in ways that haven't gotten much notice.

The law's central purpose is to expand insurance coverage to more than 30 million people. But it also reworks how consumers and businesses pay taxes and changes how the government reimburses health-care providers. It contains funding for a broad range of projects, including adolescent education on financial literacy and career preparation.

"It's probably the most important thing on our radar screen," said John Overstreet, executive director of the Indoor Tanning Association, whose members had to start paying a 10% tax on tanning-bed services in July 2010 to help pay for the law. He hopes the Internal Revenue Service would consider returning the levy to salon owners if the court strikes down the law next week.

It isn't just large employers, medical businesses and constitutional scholars nvested in the Supreme Court's decision on President Barack Obama's health overhaul, as Janet Adamy explains on The News Hub. Photo: Bryan Derballa for The Wall Street Journal.

The Business Roundtable, whose member companies provide insurance to more than 35 million Americans, has said the law has potential benefits, even as it criticized its lack of a medical liability overhaul. It recommended this week that public hearings be held before lawmakers come up with any new legislative measures on health.

Some groups have started lobbying on Capitol Hill to shape the possible replacement legislation that could emerge if the court voids the law. Mostly, action is coming from groups caught up in the first version who don't want to be part of a second.

The Food Marketing Institute, whose members include grocery stores, is trying to ensure that a replacement law wouldn't include supermarkets among those subject to calorie-listing requirements, as the current one does. The current law will eventually require eateries with 20 or more locations to list calorie contents on their menus.

"We don't operate like restaurants," said Erik Lieberman, regulatory counsel for the institute in Arlington, Va. Retailers are irked because it could mean grocers would have to list calorie totals for everything from deli potato salad to dishes of cut fruit.

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Lynn Liddle, an executive vice president at Domino's Pizza, hopes the calorie provision gets wiped out. Her concern is that pizzas would have to be labeled based on their entire calorie count, not just by slice. "People very rarely sit down and eat a whole pizza," Ms. Liddle said.

Rick Kueber, co-founder and chief executive of Sun Tan City, a 215-outlet chain based in Louisville, Ky., is tracking online news reports on how the decision could turn out. The tanning tax has driven away some customers and has subjected his facilities to audits by the IRS, he said.

Other groups are worried they will lose valued perks if the court strikes down the law. La Leche League International, a breast-feeding advocacy organization, said losing the nursing mothers' provision would set back its cause. "A lot of times the laws shape the culture, and one of the biggest challenges to breast feeding is culture," said Ms. O'Connor, who also is a spokeswoman for the group.

Doug Roll, mayor of Libby, Mont., estimates that hundreds of residents in his small town were able to enroll in Medicare thanks to a provision added to the law that allowed certain victims of environmental health hazards onto the program before age 65. A now-defunct vermiculite mine near the town exposed residents to asbestos.

After Mr. Obama signed the health overhaul in March 2010, federal officials quickly set up shop in Libby and began signing up residents for Medicare, Mr. Roll said. He signed up and said that switching from his private insurance cut his insurance costs by more than half.

Mr. Roll can't figure out whether he and other residents would immediately lose their Medicare coverage, or whether it would go away at all, if the court invalidates the law.

A spokesman for Medicare declined to comment.

"For the lower income, it would be devastating, because there is no other plan available," Mr. Roll said.

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